Device fok truing face grinding



April 20, 1954 A. J. BRYANT I DEVICE FOR TRUING FACE GRINDING WHEELSFiled June 15, 1953 uutllllliii Patented Apr. 20, 1954 UNITED STATESPATENT OFFICE DEVICE FOR TRUING FACE GRINDING WHEELS 6 Claims. 1

This invention relates to an improved truing device for setting thediamond surface of a face type grinding wheel in precise balance withits face in a plane at right angles to the axis of the wheel spindle.

An object of the invention is to provide a truing device whichcooperates with a conventional grinding wheel mount to balance any oneof a number of types and sizes of face grinding wheels that may besecured on a spindle by means of said mount.

Another object of this invention is to provide a truing device for facetype grinding wheels that has an extremely fine adjustment and which isautomatically and effectively locked in adjusted position duringrotation of the wheel.

A further object of the invention is to provide fora truing device ofthe foregoing character a safety guard which will eliminate the hazardof accidental loss of adjustment parts during operation of the grindingwheel.

With these and other objects in view the invention consists in certainconstructions and arrangements of parts that shall be hereinafter fullydescribed and pointed out in the appended claims.

In the accompanying drawings which illustrate the preferred embodimentof my invention:

Fig. 1 is a front elevation of a face type grinding wheel provided withthe truing member of this invention.

Fig. 2 is a section taken on line 22 of Fig. 1.

Fig. 3 is a section taken on line 33 of Fig. 2.

Fig. l is a section similar to Fig. 3 showing the ring guard in a wheeladjusting position.

Fig. 5 is a perspective view of the ring guard.

With reference to the drawing the numeral I indicates the usual facetype grinding wheel conventionally mounted on a rotatable spindle i l byan adaptor i2. The adaptor has a tapered bore l3 which receives thetapered end M of the spindle H, the adaptor being secured on the spindleby means of a pull-up nut l countersunk in the adaptor and threaded atIS on the end of the spindle. The adaptor has an annular flange I! atone end and is provided at its opposed end with external threads 18which form cooperative means for mounting various sizes and types offace grinding wheels on the spindle. As best shown in Fig. 2 thegrinding wheel has a central arbor I!) which closely fits the adaptor,the wheel being secured thereon by a washer 20 and a nut 2|, the latterbeing threaded to the external threads it! of the adaptor. The grindingwheel has a relatively thin circular web 200 that has an annular diamondcutting surface 220 formed around the front face of its peripheralportion.

The truing member of this invention is generally indicated by thereference numeral 22 and as best shown in Fig. 2 is preferably mountedon the adaptor between the flange I1 and the back face of the grindingwheel H3. The member essentially comprises an annular body portion 23provided with a central aperture 24 that has a slip fit connection withthe adaptor. A rearwardly extending, annular shoulder 25 is integrallyformed on the outer peripheral portion of the body 23, said shoulderextending rearwardly from the truing device body and overlapping atleast a part of the annular flange H. A number of radially extending,threaded bores 26 are formed in the member and are preferably positionedtherein such that they are partially in the annular shoulder 25 andpartially in the body 23 of the truing device, said bores each beingadapted to receive a wedge element that preferably takes the form ofcone pointed set screw 21. point of the set screws engage against theforward outer edge of the flange I! and to the better accomplishment ofthis end the said edge is preferably ground to an inclined surfacecorresponding to the taper provided the cone points of the set screws.

To true the grinding wheel after it has been mounted on the spindle itis only necessary to insert a wrench into one or more of the hexagonalsockets of the proper set screws then turning them down to advance theparticular set screws radially inwardly until a precise adjustment ismade such that an instrument will indicate that the diamond face of thewheel is in a plane at right angles to the axis of the spindle II. Avery fine adjustment can be made because the eifective axial movement ofeach set screw is decreased by the inclined engagement of the cone pointwith the flange I1. connection between the cone and the flange r createsconsiderable friction thus effectively looking the set screws againstthe flange during operation of the wheel.

My truing member may be provided with a means for retaining the setscrews within the truing member so that loose, unused set screws willnot become accidentally detached from the device during operation of thewheel. The retainer consists of a ring 28 which snugly encircles thetruing member and is provided with a number of openings 29 which inwheel ad- As best shown in Fig. 2 the cone Further the justing positionwill be in registry with the set screws so that a wrench may be insertedthere through into the socket parts of the screws.-

The ring is rotatably secured in position on the truing member byforming an annular groove 30 in the central part of the peripheral faceof the member whereby the groove intersects the boresZB-iormed therein.The groove freely receives a. number of detents 3! extending inwardlyfrom the central part of the retainer ring. formed in the ring by makinga pair of parallel slits 32 in the body of the ring and then.

driving the ring body portion between the slits inwardly into the grooveafter the ring has been.

placed in position on the member.

There will be times when only one" or two of the set screws need beadjusted to bear against the annular flange 11 of the adaptor to bringthe. wheel. into precise balance. Under these conditions the unused setscrews are liable to be turned from their bores during, operation ofthe. wheel. With the retaining ring of this invention in place these setscrews will not become detached from the truing device even though. theretainer ring is not moved to the effective guarding position shown inFig. 3' after adjustment of the set screws. Automatic closi'ng of thering. is secured by the initial accel'eration of the grinding Wheelwhich will cause the ring to slip relative to the truing device broughtabout by the inertia of the ring. Ihe ring will continue to turn untilthe detents 31' come in contact with one or more of the. screws in whichposition the openings 29' in. the ring are out of registry with the setscrews.

What. is claimed is:

1'. In a device for truing a face type grinding wheeloperatively mountedon a rotatable spindle" between an annular flange fixed on anintermediate part of the spindle and a draw up; wheel fastening meansremovably secured to the end of the spindle the combination of anannular truing member mounted concentrically on the spindle inengagement with a side of the wheel, said member having a peripheralshoulder overlapping at least a. portion of the spindle flange, acircul'arrow of. radially adjustable devices carried bythe shoulder, andeach of said? devices having a tapered inner end for operativeengagement with the adjacent face oi the spindle flange.

2. A device for truing a face type grinding wheel as set forth in claim1 characterized by the fact that the radially adjustable devices arecone pointed set screws threaded in radial bores formed through theshoulder of the annular truing member.

3; A device for truing a face type grinding wheel comprising an annularmember concentrically' mounted on the wheel spindle in engagement withthe non-grinding face of the wheel, a circular row of radiallyoperative. wedge" elements carried by the annular member, and means foradjusting the radial positions of each of the wedge elements.

4. In a device for truing a face type grinding wheel operatively mountedon a rotatable spindle between an annular flange fixed on anintermediate part of the spindle and a draw up, wheel As best shown inFig. 5 each detent is fastening means removably secured to the end ofthe spindle the combination of an annular truing member having acircular body portion provided with a central aperture slip fitted onthe spindle, an annular shoulder formed on the peripheral portion of thecircular body portion of the member, said shoulder overlapping atleasta' portionof the spindlerflange; a circular row of radiallyextending? threaded bores formed through the shoulder, and cone pointedset screws threaded in the radial bores with the points in operativeengagement with the forward face of the annular flange.

5. In a device for truing a face type grinding wheel operatively mountedon a rotatable spindle between an annular flange fixed on anintermediate part, of the spindle and a draw up, wheeL fastening meansremovably secured to the end of the spindle the combination of anannular. truing member having a circular body portion provided with a.central aperture slip fit'tedon the spindle; an annular shoulderformedion the peripheral portion of" the circular body;

portion of' the member; sa'idshoulder overlapping at least a portion ofthe spindle fiange, a: circular row of radially, extending threaded.bores formed through theshouid'er; cone pointed set screws threaded inthe radial bores with the points in operativ'ely' engagement. with theforward face of the annular" flange; and" a retainer ring encirclingthe. annular member; and havin apertures formed therethrough' positionedfor registry with" the set screws" in the annular member, means for"rotatabiy mounting the ring on the m'emb'er, and; ring stop means on theannular membe effective? to locate the" apertures' in the ringirrnonregistering' position with respect to the" set screws upon relativemovement between'thering and the annular member;

6. In a devicefor" truing a face typegrindingwheel operatively mountedon a" rotatable spindle between an annular flange fixedorr anmtermedia'te' part of the spindle" and a" draw up, wheel" fasteningmeans removabl y' secured tothe end of the spindle the combination ofanannular truing member having a circular body portion provided" with acentral aperture slip fitted on the spindle; an annular shoulder formedon the peripheral portion. of the circular body portion of" the member,said shoulder overlap ping at least a portion of the spindle" flange",a" circular row of radially extending threaded bores formed through the"shoulder; cone pointed set screws threaded in the radial bores with thepoints in operative engagement with the forward faceof the annularflange, and retainer' ring encircling the annular member, and havingapertures formed there't'hrough positioned for registry with thesetscrews in the annular member, an annular groove formed in the annul'armember and intersecting the' threaded setscrew' receiving bores formedin the member, and a number of d'etents punched in the re'- tainer' ringandextending into the groove, said detents being adapted to engageagainst the set screws to fix the operative position of the retainerring with the apertures therethro-ugh out of registry said set screws.

No references cited.

